I have a question about 45 caliber revolvers. What size is the distance between the barrel, and the cylinder supposed to be? Or should I say, what is considered the 'normal' range? I have 4 45 caliber revolvers, 2 Rugers, a Smith & Wesson, and a Cimmaron that I've had re-barreled. Of them, the space between the cylinder & barrel (I don't know if there's a name for it) on the Rugers were the largest, at .007" The Smith & Wesson model 22-4 that I just bought is .006", and the custom re-barreled Cimmaron was the smallest at .003". The way I measured them was with a feeler gauge, and the size I'm listing is the largest one that would slip between the cylinder & barrel, with the next size up (the set is in .001" steps) not slipping between them. While I haven't shot the Smith yet, the other pistols shoot just fine, I'm just curious if there's a stated min & max sizes for the gap between barrel & cylinder, as there seems to be a variation between them. Also, will the size of the gap make a difference in how well the revolver will shoot cast boolits? Thanks!